FIELD: treatment of sewage; biological purification of domestic and industrial waste water. SUBSTANCE: proposed method is performed by means of inert filling material overgrown by biological film and metal creating conditions for biological corrosion process is brought in direct contact with this film. Biological film is formed at boundary of contact of filling material with metal at reduced intensity of aeration. Concentration of freely floating activated sludge does not exceed 0.3 g/l. Treated biological film is removed from aeration zone. EFFECT: enhanced efficiency; low cost. 1 tbl
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